The bigger picture here is that a very slim few BYB even care about anything they are passin on to their puppies. They don't have normally look at the line and try to take the time to see if health traits appear to be being passed. Show breeders as...

It is less likely for a tested dog to spread genetic problems if the breeder is responsible. The AKC is not the "breeder police." Are there BYB that are responsible.? YES. Are they common? NO. It is more common to find responsible show breeders...

--"And where are these "responsible breeders" who are advocates for the purebreds when we get tons of purebreds in the shelter. I see very few who come and save there beloved breed.....purebred or not it is at risk of euthanasia. Maybe if breeders wo...

http://www.jackrussellterrierclub.com/earth_dog_trials.html
From this link it seems that the trials are very breed specific. I am guessing that they were only using the most instinctive hunting terriers. You are allowed to practice with any bree...